Large electrocaloric effects in single-crystal ammonium sulphate
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Publication Date
2016Journal Title
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
ISSN
1364-503X
Publisher
Royal Society Publishing
Language
English
Type
Article
This Version
AM
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Crossley, S., Li, W., Moya Raposo, X., & Mathur, N. (2016). Large electrocaloric effects in single-crystal ammonium sulphate. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences https://doi.org/10.17863/CAM.184
Abstract
Electrocaloric effects are typically studied near phase transitions in ceramic and polymer materials. Here we investigate electrocaloric effects in an inorganic salt, namely ammonium sulphate (NH$_4$)$_2$SO$_4$, with an order-disorder transition whose onset occurs at 223 K on cooling. For a single crystal thinned to 50 $\mu$m, we use a Maxwell relation to find a large isothermal entropy change of 30 J K$^{-1}$ kg$^{-1}$ in response to a field change of 400 kV cm$^{-1}$ . The Clausius-Clapeyron equation implies a corresponding adiabatic temperature change of 4.5 K.
Sponsorship
Royal Society
Funder references
Royal Society (uf120210)
EPSRC (EP/E03389X/1)
Identifiers
This record's DOI: https://doi.org/10.17863/CAM.184
This record's URL: https://www.repository.cam.ac.uk/handle/1810/256242
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